Boxes withstand temperatures from -80°C to 121°C, and will not degrade after repeated thaws. Each box features an alphanumeric grid on the exterior and interior, stacking rings and a matte surface suitable for markers or labels. Clear lids  and bottoms for easy visual identification. Boxes accommodate 0.5, 1.5, and 2.0 mL microtubes and most brands of cryogenic vials.